The Culligan RFC-BBSA medium particle filter cartridge reduces sediment, rust, scale, dirt, coarse sand, sand, fine sand, silt, bad taste & odor, and aesthetic chlorine taste & odor. The replacement cartridge is for use in the HD-950A and WH-HD200-C. The filter is recommended for use with city and well water supplies. The cartridge life is up to 6 months or 10,000 gallons. The cartridge is made of pleated paper and removes sediment, dirt, and rust from your water. It also has a carbon block that reduces chlorine taste and odor.